The free app requires a paid TrapCall service from five bucks a month. It lets you stop getting harassing phone calls by unmasking blocked and private phone calls. Developers claim it’s the only app in the world that can do this, speculating their workaround of the *67′s caller ID blocking feature is probably why it took Apple so long to review the app.

I think most "savvy" folks will just jailbreak their phone and use one of the free call blockers. The disadvantage of course is that you have to keep adding to the list of blocked calls in order for it to be effective.

The mentioned service is also available via AT&T for around $5 per month and I'm sure Verizon has the same service. I currently use T-Mobile which does not charge for blocking those calls and unwanted text messages.